KR100202514B1 - Shock absorbing sealing means for flow control devices - Google Patents

Abstract

The flow regulating mechanism, shown as pressure relief valves 10, 10A, is a valve member 22, 22A for reciprocating to seat on the faces 20, 20A of the stationary seating 18, 18A. Has The valve members 22, 22A are hubs 36, 36A, outer seal rings 38, 38A and seal rings 38, 38A, hubs 36, 36A. It includes a flexible connecting member 40, 40A extending between and connecting them.

Depending on the seating and reseating of the valve members 22 and 22A, the sealing rings 38 and 38A contact the stationary seating rings 18 and 18A and the flexible connecting members 40 and 40A. Is bent in accordance with the relative movement of the hubs 36 and 36A after initial contact of the sealing rings 38, 38A with the stationary seat rings 20, 20A to act as a shock absorber.

Description

Buffer seal for flow control mechanism

1 is a cross-sectional view of a paalot operated pressure relief valve with a cushioning seal of the present invention shown in the closed position.

FIG. 2 is a cross sectional view of the pilot operated pressure relief valve of FIG. 1 with a valve member shown in an open position to allow fluid flow through the valve to relieve fluid pressure. FIG.

3 is an enlarged view of the reciprocating valve member of FIGS. 1 and 2 removed from the valve body.

FIG. 4 is a partial enlarged view of FIG. 3 showing the size of the members forming the cushioning sealing device of the present invention, in which the final position of the valve member after the connecting member is bent is indicated by broken lines.

5 is a cross-sectional view of another embodiment of the present invention showing a non-pilot operated pressure relief valve in the closed position.

FIG. 6 is a partially enlarged view of FIG. 5 showing a buffered sealing device of the present invention. FIG.

FIG. 7 is an enlarged cross sectional view showing a portion of the shock absorbing sealing device in the seating position with the connecting member in which the bent position is shown by the broken line to absorb the impact force after the sealing device is seated.

* Explanation of symbols for main parts of the drawings

10: relief valve 12: valve body

14: entrance flow passage 16: exit flow passage

18: sheeting 20: sheet surface

22: valve member 24: help chamber

26: metering chamber 28: pilot valve

30: inlet line 34: suction and discharge line

36: connection hub 38: sealing ring

40: flexible connecting member 42: sealing surface

The present invention relates to a buffered sealing device for a flow regulating mechanism, and more particularly to a buffered sealing device for a reciprocating flow regulating member of a flow regulating mechanism such as a valve.

To date, as disclosed in US Pat. No. 3,433,250, issued March 18, 1969, safety relief valves have been provided with means for absorbing at least a portion of the impact force upon reseating the valve disc. However, depending on the seating of the valve disc, substantial radial deflection may occur after the initial line contact of the disc sealing surface with the fixed seat ring. Such radial deflection is undesirable and sometimes leads to inadequate wear and damage of the contact surface.

(500

) 이상의 온도와 같은 고온에서 변질된다.In addition, cushioning seals for flow control mechanisms such as valves have used elastomeric members to absorb shocks. For example, U.S. Patent No. 4,858,642, issued August 22, 1989, discloses an elastomeric member between the valve disc and the disc holder to absorb impact forces upon seating of the valve member due to reduced pressure for actuation of the valve member. Described is a pressure-operated relief valve located. Elastomeric members are eg 260

(500

) Is degraded at high temperatures such as above.

Other impact valves have used fluid metering to absorb the impact of the valve member's impact on the valve seat or to reduce the speed of movement of the valve member prior to impact to minimize impact force. These fluid metering devices are expensive, relatively complex and incapable of absorbing impact forces.

The present invention relates to a flow control mechanism in which a longitudinally movable flow control member is seated against the seat so that at least a portion of the impact force is absorbed after the movable flow control member contacts the seat.

In order to minimize wear, damage, leakage, etc. on the impact members, the impact force or energy generated by the impact is preferably dissipated or absorbed with minimal radial deflection between the contact surfaces.

The present invention shows a preferred embodiment of a flow regulating mechanism as a valve including a reciprocating valve member having a crystal sealing ring for contacting a hard seat ring in accordance with seating or reseating of the valve member. The flexible connecting member extends generally radially between the outer annular sealing ring and the valve hub. The flexible connecting member absorbs the impact force by allowing its longitudinal movement of the valve hub or body after contact of the seating and sealing ring by its flexibility.

The connecting member is inclined by a predetermined amount from the correct radial relationship to adjust the radial deflection of the sealing ring. A bending moment acts on the hinge or engagement of both ends of the flexible connection member to the valve hub and the metal sealing ring. Therefore, the size of the flexible connecting member and the sealing ring is predetermined according to the characteristics of the valve structure and the operating parameters.

It is an object of the present invention to provide a shock absorber for a high temperature flow control mechanism having a flow control member movable along a longitudinal axis and seated against the seat ring.

It is a further object of the present invention to provide a shock absorber for a flow control mechanism having a sealing ring radially outwardly of the hub that is connected to the hub via a flexible connection to contact the seat ring.

Another object of the present invention is a flexible connecting member which extends in a generally radial direction between the hub and the outer sealing ring to absorb impact force by the flexibility of the flexible connecting member after initial contact with the stationary seat ring to the stationary seat ring. To provide a flow control member.

Other objects, features and advantages of the present invention are described in detail below.

In the drawings, in particular the embodiment of the flow regulating mechanism shown in FIGS. 1 to 4, the pilot operated safety relief valve is shown at 10 and has an inlet flow passage 14 and an outlet flow passage 16. It has a valve body 12 to form a. The nozzle or seating is shown at 18 and has a generally flat seat surface 20. The fluid operated reciprocating valve member 22 has a help chamber 24 therein and is mounted to move between an open position and a closed position. The metering or damping chamber 26 reduces the impact of the valve member 22 against the seat ring 18 when moved to the closed position after being opened. The pilot valve 28 for adjusting the relief valve 10 has an inlet line 30 in fluid communication with the inlet flow passage 14 and a help line 32 extending to the help chamber 24. Suction or discharge line 34 extends into the atmosphere.

The fluid actuated valve member 22 forms an important part of the present invention and includes a body 35 having a disk comprising a central connecting hub 36, an outer sealing ring 38, and a connecting hub 36. And a flexible connecting member 40 extending between and the sealing ring 38. The sealing ring 38 has a planar sealing surface 42 suitable for contacting and seating the seating surface 20 of the seat ring 18 upon opening of the sealing member 38 with the radially inner peripheral surface of the sealing ring. Between radially outer peripheral surfaces.

The valve member 22 moves to the open position shown in FIG. 2 due to the predetermined high fluid pressure reaching the inlet flow passage 14 sensed by the pilot line 30. As the fluid pressure in the inlet flow path 14 sensed by the pilot valve 28 decreases, the valve member 22 is seated on the seat ring 18. Occasionally, the valve member 22 exerts an impact force on the seat ring 18 with attenuation of movement of the valve member 22 and in particular with a relatively rapid decrease in fluid pressure in the fluid inlet flow passage 14 after it has been opened. Move quickly to the closed seating position. Impact forces cause irregular wear or damage that affects fluid leakage in the closed position of the valve member 22.

The present invention provides a flexible connecting member (40) that bends after initial contact of the seat ring (18) with the sealing ring (38) in order to absorb impact forces, and the radially inner circumference of the outer sealing ring (38) and the connecting hub (36). Use between. The flexible connecting member 40 absorbs the impact force with minimal radial deflection and angular deflection of the sealing surface 42 on the sealing ring 38 and provides alignment between the seat surface 20 and the sealing surface 42. Is configured and arranged to have a predetermined bend to the sealing ring 38.

As shown in FIG. 4, the connecting hub 36 of the valve member 22 moves at an axial distance D after contact of the sealing surface 42 with the seat surface 20.

(0.002 inch)보다 크며, 밸브 부재(22)의 크기와 같은 요소들 및 다양한 작동 변수에 따라 0.762

(0.30 inch)이거나 또는 더 커질 수도 있다. 시트링(38)은 편평한 후면(41)을 가지며, 밸브 부재 본체(35)는 후면(41)으로부터 평상시 이격되고 시트면(20)이 밀봉링(38)에 의해 접촉된 뒤에 연결부재(41)과의 접촉시 멈추개로써 작용하는 대향면(43)을 갖는다.Distance D is at least about 0.005

Greater than (0.002 inch), depending on factors such as the size of the valve member 22 and various operating variables

(0.30 inch) or larger. The seat ring 38 has a flat rear face 41, the valve member body 35 is normally spaced from the rear face 41 and the connecting member 41 after the seat face 20 is contacted by the sealing ring 38. It has an opposing face 43 which acts as a stop when in contact with it.

The connection hub 36 is fixed to the main body 35 of the valve member 22 by a threaded bolt 44 screwed into the internal threaded opening 45. The longitudinal axis of flexible connecting member 40 is shown at 46.

The connecting member 40 is hinged to the connecting hub 36 at point 48 and to the sealing ring 38 at 50. The thickness of the connecting member 40 is shown by T.

The sealing ring 38 is shown at its maximum thickness T1 and its width W.

(0.050 inch)인 오프셋 거리 D1은 밀봉면(42)의 편향을 소량으로 최소화시키기 위해서 바람직한 것으로 알려졌다.The center of gravity of the sealing ring 38 is shown 52, at an axial distance D1 from the centerline of the connecting member 40 at the hinge point 50 in the longitudinal outward or away from the sealing surface 42. Is offset. This offset is any angular deflection or radial deflection of the sealing surface 42 according to the flexibility of the connecting member 40 resulting from the movement of the connecting hub 36 after the sealing surface 42 contacts the seat surface 20. It is known to be desirable to minimize the At least about 0.127

An offset distance D1 of (0.050 inch) has been found to be desirable to minimize the deflection of the sealing surface 42 in small amounts.

Further, in order to bend the connecting member 40 to maintain the alignment of the sealing surface 42 with respect to the seat surface 20 according to the impact of the sealing ring 38 against the seat ring 18, Preferably, the maximum thickness T1 is at least twice the thickness T of the connecting member 40 and the total thickness W of the sealing ring 38 is at least three times the thickness T of the connecting member 40.

In addition, in order to minimize the angular deflection and radial deflection of the sealing surface 42 as the connecting member 40 is bent, the longitudinal axis 46 of the connecting member 40 is rearward to make the penile thread shown by the angle A. FIG. Inclined to Each A is preferably between about 0.5 and 10 degrees to obtain satisfactory results.

The sealing surface 42 has a width that is greater than the width of the seat surface 20 for the most effective sealing action and so that a minimum radial deflection and an angular deflection occur after contact. This arrangement accommodates the lack of concentricity between the seat ring 18 and the sealing work 38. The sealing surface 42 is wider than the sheet surface 20 because it is formed of a hard surface material.

From the above description, the design of the flexible connecting member 40 between the sealing ring 38 and the connecting hub 36 is predetermined so as to have sufficient bending to absorb the impact force while minimizing the deflection of the sealing surface 42. It can be seen that.

Although the connecting hub 36, the connecting member 40, and the sealing ring 38 are shown as an integral structure, the connecting member 40 may be formed of a separating member such as a bellelle washer if necessary.

Although metal is a good material in the present invention, hard materials other than ceramic and synthetic materials resistant to high temperatures may be used in a satisfactory manner.

The term hard, as used in the specification and claims, is to be interpreted as an inelastic polymer.

5 to 7 show a pressure relief valve that is not pilot operated as another embodiment of the present invention.

The pressure relief valve 10A has a valve body 12A that includes an inlet flow passage 14A and an outlet flow passage 16A.

The nozzle or seat ring 18A has a flat seat surface 20A.

Spindle 22A has a bore 45A.

The pressure relief valve 10A includes a hub 36A, a sealing ring 38A and a flexible connecting member 40A fitted in the bore 45A. The spring 57A presses the spindle 22A and the sealing ring 38A to the seated position on the seat surface 20A of the seat ring 18A. As the predetermined high fluid pressure reaches the inlet flow passage 14A, the spindle 22A and the sealing ring 38A are outwardly opposed to the bias of the spring 57A to allow fluid flow through the outlet flow passage 16A. Pushed. As the fluid pressure decreases in the inlet flow passage 14A, the spindle 22A under the bias of the spring 57A moves the sealing ring 38A to the seating position on the seat surface 20A of the seat ring 18A.

The flexible connecting member or web 40A acts in the same manner as in the embodiment of FIGS. 1 to 4, except that at each A except the inclination of the connecting member 40A and the position of the spherical center 52A. Same as the embodiment of FIGS. 1 to 4. The longitudinal axis 46A of the connecting member 40A has a double inclination, shown at angle A between the hinge points 48A, 50A.

The angle A is the same as the angle A in the embodiment of FIGS. 1 to 4, but is inclined toward the surface 42A instead of the inclination away from the surface 42A in the embodiment of FIGS. Also, in order to minimize deflection of the face 42A after contact with the seat face 20A, the center of gravity 52A of the sealing ring 38A is at the hinge point 50A towards the face 42A as shown by D1. Located forward. The distance D1 is the same as the distance D1 in the embodiment in FIGS. 1 to 4 except that it is in the opposite direction, minimizing the deflection of the surface 42A due to the bending of the connecting member 40A. The hub 36A moves at a distance D as in the embodiment of FIGS. 1-4, with the surfaces 41A, 43A contacting to limit the movement of the hub 36A past the elastic limit of the connecting member 40A. Combined into a state.

Although illustrated as using the pressure relief valve of the present invention, the present invention is in conjunction with other types of fluid flow regulating mechanisms, such as pumps, check valves, etc., in which a reciprocating flow regulating member is provided for seating and reseating of an annular seating ring. Can also be used.

Accordingly, modifications and variations of the preferred embodiments are possible for those skilled in the art. However, such changes and modifications are intended to fall within the spirit and scope of the present invention as set forth in the appended claims.

Claims (30)

A fluid operated valve having a valve body including a flow passage and a rigid annular seating mounted in the valve body relative to the flow passage, the fluid operated valve being mounted within the valve body for movement between an open position and a closed position with respect to the flow passage. A fluid pressure sensitive reciprocating valve member adapted to exert an impact force on the hard seating in response to a change in pressure of the fluid when seated on the hard seating and seated on the hard seating, the valve member being centered. An outer annular sealing ring radially spaced from the central hub for seating with the hub and face-to-face contact with respect to the seat ring in the closed position of the valve member, generally between the hub and the sealing ring It extends in the radial direction and the hard seal ring and the hard seal ring to absorb the impact force due to the contact of the hard seal ring to the hard seat ring Fluid actuated valve characterized in that the seat ring comprises after initial contact of a flexible connection member is bent between the hub and the outer seal ring. 2. The fluid operated valve of claim 1, wherein the seal ring and the seat ring have generally flat sealing surfaces that contact each other in the closed position of the valve member. The sealing member of claim 1, wherein the connecting member is inclined from the hub to the seating ring in a direction perpendicular to the radial direction to provide increased resistance to radial deflection of the sealing ring after initial contact of the sealing ring to the seating ring. Fluid-operated valve, characterized in that. 4. A fluid operated valve according to claim 3, wherein the connecting member is hinged to the hub and the sealing ring at both ends thereof. 4. The method of claim 3 wherein the connecting member is inclined in a direction away from the hard seating such that the center of gravity of the hard sealing ring is positioned axially outward of the connecting member with respect to the hard seating to minimize the radial deflection of the sealing ring. A fluid operated valve characterized by the above-mentioned. 4. The connecting member according to claim 3, wherein the connecting member is inclined in a direction toward the hard seating such that the center of gravity of the sealing ring is positioned axially inward of the connecting member with respect to the hard seating in order to minimize the radial deflection of the sealing ring. A fluid operated valve characterized by the above-mentioned. The method of claim 1, wherein about 0.005 to 0.076 after initial contact of the sealing ring and the seat ring such that the hub of the valve member acts to bend the connecting member.

And axially move at a distance between (0.002 and 0.030 inch). 2. The fluid operated valve of claim 1, wherein the hub and the connecting member are integrated. The fluid operated valve of claim 1, wherein the sealing ring and the connecting member are integrated. The fluid operated valve of claim 1, wherein the hub, sealing ring, and flexible connecting member are of a single piece, integral structure. The method of claim 1, wherein the width of the sealing ring measured in a direction parallel to the longitudinal axis of the valve member is at least three times the thickness of the connecting member, and the sealing ring measured in the direction crossing the longitudinal axis of the valve member. A fluid operated valve, characterized in that the thickness is at least about twice the thickness of the connection site. A fluid actuated flow control mechanism having a body including a flow passage and a rigid annular seating mounted within the valve body relative to the flow passage, the fluid operated flow adjustment mechanism being mounted within the body for movement between an open and closed position with respect to the flow passage. A fluid pressure sensitive reciprocating flow regulating member adapted to exert an impact force on the hard seat in response to a pressure change of the fluid when seated on the hard seating and seated on the hard seating, the flow regulating member comprising: A central hub, an outer annular sealing ring radially spaced from the central hub so that the seat ring is seated in face-to-face contact in a closed position of the flow control member, and generally radially extending and rigidly sealing between the hub and the sealing ring After initial contact of the ring with the hard seat ring and subsequent longitudinal movement of the hub to the sealing ring, A rigid seal ring contacts the fluid-operated flow control which comprises an amount sufficient to absorb the impact load to a flexible connection member is bent between the outer sealing ring and the hub due to the mechanism. 13. The fluid operated flow control mechanism of claim 12 wherein the maximum thickness of the sealing ring measured in the direction crossing the longitudinal axis of the flow control member is at least about twice the thickness of the flexible connection member. 13. The fluid actuated flow regulating mechanism according to claim 12, wherein the hub, the sealing ring and the connecting member have a unitary single piece structure. 15. The fluid actuated flow regulating mechanism of claim 14 wherein the width of the sealing ring measured in a direction parallel to the longitudinal axis of the flow regulating member is at least three times the thickness of the connecting member. A fluid actuated pressure relief valve comprising a valve body comprising a flow passage and a stationary annular metal seating mounted within the valve body relative to the flow passage, the valve for movement between an open position and a closed position with respect to the flow passage. A fluid pressure sensitive reciprocating pressure relief valve member mounted within the body and adapted to exert an impact force upon seating on the closed metal seat ring and seated on the metal seat ring, the pressure relief valve member being a central hub. And an outer annular sealing ring radially spaced from the central hub to seat in the metal-to-metal contact with the stationary metal seat ring in the closed position of the valve member, and generally radially extending between the hub and the sealing ring. Gold after initial contact of the metal sheeting and subsequent longitudinal movement of the hub to the sealing ring And a flexible connection member that bends between the hub and the outer seal ring to absorb impact load resulting from contact of the metal seal ring to the inner seat ring. 17. The hub of claim 16 wherein the hub is at least 0.005 relative to the sealing ring after contact of the sealing ring and the seat ring.

(0.002 inch) moving, wherein the maximum thickness of the sealing ring measured in the direction crossing the longitudinal axis of the valve member is at least twice the thickness of the connecting member. 17. The fluid actuated pressure relief valve of claim 16, wherein the hub, sealing ring, and connecting member are in one piece piece construction. A fluid actuated flow control mechanism having a body defining a fluid flow passage, the fluid actuating flow regulating mechanism comprising: a rigid annular seating positioned within the body relative to the flow passage and mounted in the body for movement between an open and closed position with respect to the flow passage; A fluid pressure sensitive reciprocating flow regulating member, a rigid seal ring on the flow regulating member, adapted to seat in a closed position on the hard seating and exerting an impact force upon seating on the hard seating, and one end thereof A flexible connecting member hingedly connected to one of the rings and extending generally radially from the one ring, the impact due to the impact of the flow regulating member relative to the hard annular seating and subsequent longitudinal movement of the flow regulating member Sufficient to absorb the impact load acting on the hard annular seat ring upon axial movement of one ring The flexible connection ends for relative flexing movement between the flexible connecting fluid-operated flow characterized in that it comprises means for connecting the other end of the hinge member of the adjusting mechanism member. 20. The fluid actuated flow control mechanism of claim 19, wherein the width of the one ring measured in a direction parallel to the longitudinal axis of the oil species adjusting member is at least three times the thickness of the connecting member. 20. The sealing ring and the seating ring of claim 19, wherein the sealing ring and the seating ring have generally flat contact surfaces in which the width of the contact surface of the sealing ring is greater than the width of the contact surface on the seating ring, the flat contact surfaces initially contacting each other along the entire width of the seating surface and An actuating flow regulating mechanism, which provides a minimum deflection between the contact surfaces. 22. The fluid operated flow control mechanism of claim 21 wherein said one ring is a sealing ring and is mounted to a flow control member. 20. The fluid actuated flow control mechanism of claim 19, wherein the maximum thickness of said one ring measured in the direction crossing the longitudinal axis of the flow control member is at least about twice the thickness of the flexible connection member. A fluid actuated flow regulating mechanism having a body including a fluid passage and a stationary annular metal seating mounted within the valve body relative to the flow passage, the fluid actuating flow regulating mechanism being mounted within the body for movement between an open position and a closed position with respect to the flow passage. And a fluid pressure-sensitive reciprocating flow control member adapted to seat in a closed position on the metal seat ring and exert an impact force upon seating on the metal seat ring, the flow control member comprising a central hub and a flow control member. An outer annular metal seal ring radially spaced from the central hub to seat in the face-to-face contact with the metal seat ring in a closed position, and generally radially extending between the hub and the seal ring, the initial position of the metal seal ring and the metal seat ring Contact of the metal sealing ring to the metal seat ring after the subsequent longitudinal movement of the hub to the contact and sealing ring At least 0.005 to absorb the resulting impact load

And a flexible connection member that bends between the hub and the outer sealing ring in an amount of about (0.002 inch). 25. The fluid actuated flow control mechanism of claim 24, wherein the maximum thickness of the metal seal ring measured in the direction crossing the longitudinal axis of the flow control member is at least twice the thickness of the flexible connection member. 25. The fluid actuated flow regulating mechanism of claim 24 wherein the hub, sealing ring, and connecting member are of a unitary single piece metal structure. 27. The fluid operated flow control mechanism of claim 26 wherein the width of the sealing ring measured in a direction parallel to the longitudinal axis of the flow control member is at least three times the thickness of the connecting member. A fluid operated flow control mechanism having a body defining a fluid flow passage, the fluid operated flow regulating mechanism comprising: a metal annular seating located within the body relative to the flow passage and mounted within the body for movement between the open and closed positions for the flow passage; A reciprocating flow regulating member, a metal sealing ring on the flow regulating member for bonding to a seated position on the rigid seating and exerting an impact force when seated on the hard seating, and one end of which is one of the rings A flexible connecting member hinged to and extending substantially radially from the one ring, and the one ring due to the impact of the flow regulating member relative to the metal seat ring and subsequent longitudinal movement of the flow regulating member. At least 0.005 so that the axial direction simultaneously absorbs the impact load acting on the metal sheeting

Means for hingeally connecting the other end of the flexible connection member for relative bending movement between the ends of the flexible connection member in an amount of (0.002 inch), the metal sealing ring and the metal sheet The ring has generally flat contact surfaces whose width of the contact surface of the one ring is larger than the width of the contact surface on the other ring and the flat contact surfaces initially contact each other along the entire width of the other ring surface and provide minimal deflection between these contact surfaces. Fluid-operated flow control mechanism, characterized in that. 29. The fluid actuated flow regulating mechanism of claim 28 wherein the maximum thickness of said one ring measured in the direction crossing the longitudinal axis of the flow regulating member is at least about twice the thickness of the flexible connecting member. 30. A fluid actuated flow regulating mechanism according to claim 29, wherein said one metal ring and said connecting member are of a single piece metal structure.